The European Central Bank is proposing a rule change to force banks to post collateral against all of any non-performing loan, reports The FT. The changes would make it more expensive for lenders to hold a stock of bad debt, although they would only apply to loans declared non-performing after January next year and not to the large stockpile of already existing NP loans. A public consultation will be held on the planned rule change next month. The ECB has also indicated it has plans to deal with that stockpile of bad debts, promising fresh policies by the end of March on how to handle them.